Possible Clues:

• This joins up if one listens
• Doesn't need to be drafted
• Rolls following first pair of English volunteers?
• Joins up broken lines thus vacantly
• Parisian in heels joins men in uniform
• Listens out for volunteers
• Recruits being regularly on the field of combat once
• Starts private work?
• Enrols in the forces
• Signs up for the Army